JP4519582B2 - Flat cable for balanced transmission with connector - Google Patents

Description

  The present invention relates to a flat cable for balanced transmission with a connector portion, and a flat plate for balanced transmission with a connector portion, in which a terminal portion at the end of the flat cable for balanced transmission can be directly connected to a contact of a mating connector. Related to cable.

  As a data transmission method, a normal transmission method using one electric wire for each data, and two signals paired for each data, a + signal to be transmitted and this + signal are There is a balanced transmission system in which signals of equal and opposite directions are transmitted simultaneously. The balanced transmission system has the advantage that it is less susceptible to noise than the normal transmission system, and is being increasingly adopted in the field of transmitting signals at high speed.

Conventionally, in order to perform balanced transmission of signals between two devices, and to balance transmission of signals within one device, multiple pairs of wires are contained inside a double-coated tube as a cable. A cable with a connector to which a connector incorporating a contact is connected is used at this end.
JP 2003-059593 A

  A conventional cable with a connector is expensive because the cost of the cable itself is high and the cost of the connector is high. Also, the cable itself is bulky and unsuitable for connecting between a predetermined location inside the device and another location.

  In addition, the paired wires and the contact on the fixed connector mounted on the printed circuit board are connected between the connector contacts at the end of the cable and the connectors on the end of the paired wire and the end of the cable. There is a possibility that the connection portion with the contact may affect the characteristics of balanced transmission.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a balanced transmission flat cable with a connector portion that is reduced in size and the like.

Therefore, in order to solve the above problems, the present invention has a configuration in which a pair of signal transmission paths and ground portions are alternately arranged so that balanced transmission is possible, and a signal terminal portion that forms a pair at the end portion. And a flat cable member for balanced transmission having a configuration in which the ground terminal portion is exposed, and a signal terminal portion itself of the flat cable member for balanced transmission, which is attached to an end of the flat cable member for balanced transmission And a connector portion forming member for forming a connector portion having the ground terminal portion itself as a terminal portion, and having the connector portion at an end portion of the flat cable member for balanced transmission, and the flat cable member for balanced transmission. Are a first signal line pattern for transmitting a + signal constituting a pair, a second signal line pattern for transmitting a-signal having the same magnitude and opposite direction as the + signal, and a linear shape on the upper surface of the base sheet. In The ground line patterns are alternately arranged, and the end of the base sheet has a ground terminal part at the end of the ground line pattern and a first signal terminal part at the end of the first signal line pattern. A ground plane pattern that is planar is formed on the lower surface of the first flexible printed cable and the base sheet that are alternately arranged, and an end of the base sheet is a ground plane pattern A second flexible printed cable having a configuration in which a ground terminal portion and a second signal terminal portion are alternately arranged, and the first flexible printed cable is disposed on the second flexible printed cable. And the second signal line pattern and the second signal terminal portion are conductively connected, and the gland is bonded. The linear pattern and the ground plane pattern are conductively connected .

  According to the present invention, a flat cable for balanced transmission can be used to connect between devices or between two locations inside the device, and ensure good balanced transmission characteristics. It is possible.

  Next, an embodiment of the present invention will be described.

  1A and 1B show a flexible transmission cable connector device 10 for balanced transmission according to a first embodiment of the present invention. The balanced transmission flexible printed cable connector apparatus 10 includes a socket 20 and a balanced transmission flexible printed cable 40 with a plug-type connector. FIG. 2A shows a balanced transmission flexible printed cable 40 with a plug-type connector portion facing the socket 20 and FIG. 2B shows a connected state. FIG. 2 shows the arrangement of the terminal part of the plug-type connector part and the arrangement of the contact part of the socket 20 of the balanced transmission flexible printed cable 40 with the plug-type connector part. 2A shows the arrangement in the state immediately before the connection shown in FIG. 1A, and FIG. 2B shows the arrangement in the connected state shown in FIG. 1B. 3 is a cross-sectional view taken along line III-III, which is the location of the signal contact in FIG. 1A, and FIG. 4 is a cross-sectional view taken along line IV-IV, which is the location of the ground contact in FIG. is there. In the drawings, X1-X2 and Z1-Z2 are the width direction and height direction of the plug-type connector portion 80 and the socket 20 of the balanced transmission flexible printed cable 400 with the plug-type connector portion, respectively. Y1 is a direction in which the plug-type connector 80 is inserted into the socket 20, and Y2 is a direction in which the plug-type connector 80 is removed from the socket 20.

[Socket 20]
First, the socket 20 will be described. As shown in FIGS. 5 and 6A to 6D, the socket 20 is a so-called right-angle type, and the socket body 21 has first and second right-angle shapes from the back side (Y1 side). The signal contacts 31, 32 and the right-angle-shaped ground contact 33 are incorporated side by side. The socket body 21 has a configuration in which a socket part 22, which is an electrically insulating resin molded part, is wrapped in a metal plate case 23.

  The socket main body 21 has an opening 24 long in the X1-X2 direction into which the plug-type connector 80 of the balanced transmission flexible printed cable 40 with a plug-type connector is inserted in the center, and guide holes 25a, 25b, and locking openings 26a and 26b are formed on both side surfaces. Grooves 27 and 28 for fitting the contact portions are formed on the top and bottom surfaces of the opening 24. The first signal contact 31 and the second signal contact 32 forming a pair are aligned in the column direction (Z1-Z2 direction), and the first and second signal contacts 31, 32 and plate-like ground contacts 33 are incorporated alternately in the row direction (X1-X2 direction). The first and second signal contacts 31, 32 have contact portions 31a, 32a and right-angle mounting terminal portions 31b, 32b. The ground contact 33 includes fork-shaped contact portions 33a and 33b and a right-angle mounting terminal portion 33c. The contact portion 31 a and the contact portion 33 a are fitted in the groove 27 on the top plate surface of the opening 24, and the contact portion 32 a and the contact portion 33 b are fitted in the groove 28 on the lower side surface of the opening 24. The mounting terminal portions 31 b, 32 b, and 33 c are arranged on the back side of the socket body 21.

  As shown in FIGS. 1 to 4, the socket 20 is mounted and fixed on the printed circuit board 35 by soldering the mounting terminal portions 31 b, 32 b, and 33 c to the pads of the printed circuit board 35.

  Next, the balanced transmission flexible printed cable 40 with a plug-type connector will be described.

FIG. 7 shows a balanced transmission flexible printed cable 40 with a plug-type connector portion, which is disassembled into a balanced transmission flexible printed wiring board member 41 (hereinafter referred to as a balanced transmission flexible printed cable member) and a plug portion forming member 70.

  The balanced transmission flexible printed cable 40 with a plug-type connector portion has a configuration in which plug portion forming members 70 are attached to both ends of a balanced transmission flexible printed cable member 41.

[Flexible printed cable member 41 for balanced transmission]
First, the balanced transmission flexible printed cable (FPC) member 41 will be described.

  FIG. 8 shows the structure of the balanced transmission flexible printed cable member 41, and FIG. 9 shows an enlarged arrangement of terminal portions at the end of the balanced transmission flexible printed cable member 41. 10 is a sectional view taken along line XX in FIG. 8, FIG. 11 is a plan view, and FIG. 12 is a bottom view. In FIGS. 11 and 12, the protective film on the surface is omitted.

In the balanced transmission flexible printed cable member 41, the first flexible printed wiring board 42 (hereinafter referred to as the first flexible printed cable) is placed on the second flexible printed wiring board 60 (hereinafter referred to as the second flexible printed cable) . It is a laminated structure in which the layers are bonded to each other except for the portions at both ends, and conduction is obtained at a plurality of locations.

  As shown in FIGS. 8, 10, and 11, the first flexible printed cable 42 has a linear ground pattern 44, a first signal line pattern 45, and an upper surface of a synthetic resin base sheet 43. The second signal line pattern 46 is formed side by side in parallel. The first and second signal line patterns 45 and 46 are close to each other. The ground line pattern 44 has a width W wider than that of the signal line patterns 45 and 46. The approaching first and second signal line patterns 45 and 46 are sandwiched by ground line patterns 44. The first signal line pattern 45 is a pattern for transmitting a + signal, and the second signal line pattern 46 is a pattern for transmitting a-signal having the same magnitude as that of the + signal but in the opposite direction. The first and second signal line patterns 45 and 46 make a pair.

  The end portion 42a on the Y1 side of the first flexible printed cable 42 is formed on the upper surface of the base sheet 43 made of synthetic resin, between the ground terminal portion 44a at the end of the ground linear pattern 44 and the end of the first signal line pattern 45. The first signal terminal portions 45a are alternately arranged on X1-X2. The end of the second signal line pattern 46 is connected to a via 47 located in front of the end portion 42a, and this is the end.

  The Y2 side end portion 42b of the first flexible printed cable 42 is formed on the upper surface of the base sheet 43 on the ground terminal portion 44b at the end of the ground line pattern 44 and the first signal at the end of the first signal line pattern 45. Terminal portions 45b are arranged alternately on X1-X2. The end of the second signal line pattern 46 is connected to a via 48 positioned in front of the end portion 42b, and this is the end.

  Each ground line pattern 44 is formed with a plurality of vias 49 that penetrate the base sheet 43 and reach the lower surface of the base sheet 43.

  A protective film 50 is formed on the upper surface of the first flexible printed cable 42 except for the end portions 42a and 42b, and a ground line pattern 44, a first signal line pattern 45, and a second signal line are formed. The pattern 46 and the vias 47 and 48 are covered with a protective film 50.

  As shown in FIGS. 8, 10, and 12, the second flexible printed cable 60 has a planar ground pattern 62 on the lower surface of the synthetic resin base sheet 61 except for the end portions 60 a and 60 b. It is formed. In addition, vias 63 and 64 are formed at positions outside the ground plane pattern 62 and corresponding to the vias 47 and 48 described above.

  At the end portion 60a on the Y1 side, the ground terminal portions 62a and the second signal terminal portions 65a are alternately arranged on X1-X2. The ground terminal portion 62 a extends from the ground plane pattern 62. The second signal terminal portion 65 a is connected to the via 63.

  At the end portion 60b on the Y2 side, the ground terminal portions 62b and the second signal terminal portions 65b are alternately arranged on X1-X2. The ground terminal portion 62 b extends from the ground plane pattern 62. The second signal terminal portion 65 b is connected to the via 64.

  In the ground plane pattern 53, a plurality of vias 66 that penetrate the base sheet 61 and reach the upper surface of the base sheet 63 are formed at positions corresponding to the vias 49.

  A protective film 67 is formed on the lower surface of the second flexible printed cable 60 except for the end portions 60 a and 60 b, and the ground plane pattern 62 and the vias 63 and 64 are covered with the protective film 67.

  The first flexible printed cable 42 is overlaid on the second flexible printed cable 60, and is bonded except for both end portions. Further, as shown in FIG. 9, the via 47 and the via 63 are connected. Via 48 and via 64 are similarly connected. As shown in FIGS. 9 and 10, the via 47 and the via 63 are connected.

  Looking at the first and second signal line patterns 45 and 46 forming a pair of the balanced transmission flexible printed cable member 41, the first and second signal line patterns 45 and 46 are shown in cross section in FIG. , Both sides in the X1-X2 direction are sandwiched by the ground linear pattern 44, and the Z2 side is covered and shielded by the ground plane pattern 62, and is hardly affected by noise from the outside.

  The first and second signal line patterns 45 and 46, the ground line pattern 44, and the ground plane pattern 62 are formed with good dimensional accuracy by etching, and the thicknesses of the base sheets 43 and 61 are also accurate. Therefore, the impedance of the first and second signal line patterns 45 and 46 is accurately determined to be a target 100Ω.

Looking at the end of the balanced transmission flexible printed cable member 41 on the Y1 side, the end portion 42a and the end portion 60a face each other without being bonded, and as shown in an enlarged view in FIG. 9, Z1-Z2 In the direction, the ground terminal portion 44a and the ground terminal portion 62a are aligned, and the first signal terminal portion 45a and the second signal terminal portion 65a are aligned.
The ground terminal portions 44a and 62a and the first and second signal terminal portions 45a and 65 are aligned correspondingly to the contact portions 33a and 33b and the contact portions 31a and 32a in the socket 20.

  Looking at the end of the balanced transmission flexible printed cable member 41 on the Y2 side, the end 42b and the end 60b are opposed to each other in the Z1-Z2 direction, like the Y1 end. In addition, the ground terminal portion 44b and the ground terminal portion 62b are aligned, and the first signal terminal portion 45b and the second signal terminal portion 65b are aligned in the same manner as described above.

[Plug part forming member 70]
Next, the plug part forming member 70 will be described.

  As shown in FIGS. 7 and 13A to 13E, the plug portion forming member 70 is an electrically insulating resin molded part, and has a shape that is symmetrical with respect to the Y axis at the center in the X1-X2 direction. Base parts 71, 72 on both sides, a plug core part 73 between the base part 71 and the base part 72, guide arm parts 74, 75 extending in the Y1 direction from the ends of the base parts 71, 72, And lock arm portions 76 and 77 on the outer side surfaces of the guide arm portions 74 and 75.

  The plug core 73 has a plate shape that is long in the X1-X2 direction, is dimensioned to fit into the opening 24 of the socket 20, protrudes in the Y1 direction from the base portions 71 and 72, and tapers at the end in the Y1 direction. Part 73a. As shown in FIGS. 7 and 13C, the upper surface (Z1 side surface) of the plug core portion 73 is positioned corresponding to the thickness of the first flexible printed cable 42 on the Y1, X1, and X2 sides. Ridges 73b, 73c, and 73d for the three sides, and a plane portion 73e having a shape corresponding to the end portion 42a inside the three ridges 73b, 73c, and 73d. The flat surface portion 73e has a shallow concave shape with respect to the ridge portions 73b, 73c, and 73d. As shown in FIG. 13A, the lower surface (Z2 side surface) of the plug core portion 73 also corresponds to the three ridges 73f, 73g, 73h and the end portion 60a, similarly to the upper surface of the plug core portion 73. And has a shallow concave flat surface portion 73i.

  Each of the guide arm portions 74 and 75 has a prismatic shape, and has a dimension that fits into the guide holes 25 a and 25 b of the socket 20.

  The lock arm portions 76 and 77 are cantilevered arm portions that are fixed on the Y1 side, have operation portions 76a and 77a on the Y2 side, and have locking convex portions 76b and 77b in the middle.

[Flexible transmission cable 40 for balanced transmission with plug-type connector]
As shown in FIG. 7, the end portion 42a and the end portion 60a on the Y1 side of the balanced transmission flexible printed cable member 41 are opened apart in the Z1-Z2 direction, as shown in FIGS. As shown, the end portion 42 a is fitted and fixed to the flat portion 73 e on the upper surface of the plug core portion 73 of the plug portion forming member 70, and the end portion 60 a is fitted to the flat portion 73 i on the upper surface of the plug core portion 73. The plug-type connector portion 80 is formed by being bonded and fixed.

  The end 42a is abutted on the edge of the protrusion 73b to determine the position of the end 42a in the Y1-Y2 direction, and on both sides X1-X2 by the ends of the protrusions 73c, 73d and the bases 71, 72. The position of the direction has been determined. Also for the end 60a, the positions of the Y1-Y2 direction are determined by the ends of the ridges 73f, 73g, 73h and the bases 71, 72, and both sides of the ridges 73c, 73d and the bases 71, 72 are determined. A position in the Y1-Y2 direction and a position in the X1-X2 direction are determined by the ends.

  The plug-type connector portion 80 has sufficient mechanical strength because the plug core portion 73 forms a core, and the ground terminal portions 44a and 62a and the first and second signal terminal portions 45a and 65a. Has a structure in which the contact portions 33a and 33b and the contact portions 31a and 32a in the socket 20 are aligned with high precision correspondingly.

  Similarly to the above, the Y2 side of the balanced transmission flexible printed cable member 41 is also bonded to the plug portion forming member to form a plug type connector portion.

  In the balanced transmission flexible printed cable 40 with the plug-type connector portion, as shown in FIG. 1 (B), the guide arm portions 74 and 75 are fitted into the guide holes 25a and 25b, respectively, and the position with respect to the socket 20 is determined. Thereafter, the plug-type connector portion 80 is inserted into the opening 24 of the socket 20 and is connected to the socket 20 by strongly pushing in the Y1 direction. When connected, the state shown in FIG. 2B and the state shown by the two-dot chain line in FIGS. 3 and 4 are obtained, and the ground terminal portions 44a and 62a are directly connected to the fork-like contact portions 33a and 33b of the ground contact 33, respectively. The first signal terminal portion 45a is in direct contact with the contact portion 31a of the first signal contact 31, and the second signal terminal portion 65a is in direct contact with the contact portion 32a of the second signal contact 32. Is done.

  Accordingly, signals are balanced and transmitted between the balanced transmission flexible printed cable 40 with the plug-type connector portion and the socket 20. Here, in particular, the first and second signal terminal portions 45a and 65a at the ends of the balanced transmission flexible printed cable member 41 are directly electrically connected to the contact portions 31a and 32a without any intervening therebetween. Therefore, the loss of transmission characteristics at the point where the balanced transmission flexible printed cable 40 with the plug-type connector portion is connected to the socket 20 is minimized.

  Further, the locking convex portions 76b and 77b engage with the locking openings 26a and 26b, respectively, and the balanced transmission flexible printed cable 40 with the plug-type connector portion is locked to the socket 20.

  FIG. 14 shows a flexible flat cable (FFC) 100 for balanced transmission with a plug-type connector portion according to a second embodiment of the present invention. The balanced transmission flexible flat cable 100 with the plug-type connector portion uses a balanced transmission flexible flat cable member 101 instead of the balanced transmission flexible printed cable member 41 in the first embodiment. In this configuration, the end of the member 101 is bonded to the plug portion forming member 70.

  As shown in FIGS. 15 and 16, the balanced transmission flexible flat cable member 101 is formed by overlapping the first flexible flat cable 102 on the second flexible flat cable 112, which is the same as the first flexible flat cable 102. The structure is bonded except for. The balanced transmission flexible flat cable member 101 is less expensive than the balanced transmission flexible printed cable member 41 of the first embodiment.

  The first flexible flat cable 102 is arranged in an electrically insulating covering 105 in a state where ground wires 103 and first signal wires 104 for transmitting a + signal are alternately arranged in parallel. The end portion 102a is formed by removing the upper surface portion of the covering 105, exposing the electric wires 103 and 104, and forming the ground terminal portion 103a and the first signal terminal formed by the exposed electric wires. In this configuration, the portions 104a are alternately arranged.

  In the second flexible flat cable 112, the ground electric wire 113 and the second signal electric wires 114 for transmitting a negative signal having the same magnitude and the opposite direction as the positive signal are alternately arranged in parallel. The end portion 101a is disposed in the electrically insulating cover 115, and the end portion 101a is formed by removing the lower surface portion of the cover 114, exposing the wires 113 and 114, and forming an exposed wire. The ground terminal portion 113a and the second signal terminal portion 114a to be arranged are alternately arranged in line.

  In the balanced transmission flexible flat cable member 101 in which the first flexible flat cable 102 is overlapped and bonded onto the second flexible flat cable 112, the first signal wire 104 and the second signal wire 114 are paired. Therefore, the ground wire 103 and the ground wire 113 are also arranged in the row direction (Z1-Z2 direction), and the first and second lines forming the pair are arranged in the row direction (Z1-Z2 direction). The two signal wires 104 and 114 and the ground wires 103 and 113 are alternately arranged in the row direction (X1-X2 direction).

  The end portion 102a of the first flexible flat cable 102 of the balanced transmission flexible flat cable member 101 is positioned and bonded to the upper surface of the plug core portion 73 of the plug portion forming member 70, and the end portion of the second flexible flat cable 112. 112 a is positioned and bonded to the lower surface of the plug core portion 73 to form a plug-type connector portion 120.

  The plug-type connector portion 120 has sufficient mechanical strength when the plug core portion 73 forms a core, and the ground terminal portions 103a and 113a and the first and second signal terminal portions 104a and 114a are illustrated. 5 and 6 and the contact portions 33a and 33b and the contact portions 31a and 32a in the socket 20 are arranged in a correspondingly accurate manner.

  Similarly to the balanced transmission flexible printed cable 40 with the plug-type connector portion of the first embodiment, the balanced transmission flexible flat cable member 100 with the plug-type connector portion is placed in the opening 24 of the socket 20. The ground terminal portions 103a and 113a and the first and second signal terminal portions 104a and 114a are directly connected to and connected to the contact portions 33a, 33b, 31a, and 32a.

  In addition, it replaces with the plug part formation member 70, the member which forms a jack part is used, and the shape of the end part of the flexible printed cable member for balanced transmission or the flexible flat cable member for balanced transmission is changed, and a terminal It is also possible to employ a configuration in which jack-type connector portions whose portions face inward are provided at the end portion of the balanced transmission flexible printed cable member or the balanced transmission flexible flat cable member.

  In addition, the present invention can be configured such that a plug portion forming member is provided at an end portion of a flexible printed cable member or a flexible flat cable member applied to a normal transmission system, and the plug portion is provided at the end portion. .

It is a figure which shows the flexible printed cable connector apparatus for balanced transmission of Example 1 of this invention. It is a figure which shows roughly arrangement | positioning of the terminal part of a plug-type connector part, and arrangement | positioning of the contact part of a socket corresponding. FIG. 3 is an enlarged cross-sectional view taken along line III-III, which is the location of the signal contact in FIG. FIG. 4 is an enlarged cross-sectional view taken along line IV-IV, which is the location of the ground contact, in FIG. It is a perspective view which shows a socket with a contact. It is a figure which shows a socket. It is a perspective view which decomposes | disassembles and shows the edge part of the flexible printed cable member for balanced transmission with a plug-type connector part. It is a perspective view which shows the flexible printed cable member for balanced transmission. It is a perspective view which shows roughly the structure of the edge part of the flexible printed cable member for balanced transmission of FIG. It is an expanded sectional view which follows the XX line in FIG. It is a top view of the flexible printed cable member for balanced transmission of FIG. It is a bottom view of the flexible printed cable member for balanced transmission of FIG. It is a figure which shows a plug part formation member. It is a perspective view which shows the one end part side of the flexible printed cable member for balanced transmission with a plug-type connector part of Example 2 of this invention. FIG. 15 is an enlarged sectional view taken along line XV-XV in FIG. 14. It is an expanded sectional view which follows a XVI-XVI line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Flexible transmission cable connector apparatus for balanced transmission 20 Socket 40 Flexible printed cable for balanced transmission with plug type connector part 41 Flexible printed cable member for balanced transmission 42 First flexible printed cable 42a, 42b End part 43 Base sheet 44 Ground wire shape Pattern 44a Ground terminal portion 45 First signal line pattern 45a First signal terminal portion 46 Second signal line pattern 46a Second signal terminal portion 47, 48, 49 Via 60 Second flexible printed cable 60a, 60b End Part 61 Base sheet 62 Ground surface pattern 62a Ground terminal part 63, 64 Via 65a Second signal terminal part 70 Plug part forming member 71, 72 Base part 73 Plug core part 73b, 73c, 73d, 73 f, 73g, 73h Projection strips 73e, 73i Plane section 74, 75 Guide arm section 80 Plug-type connector section 100 Flexible flat cable for balanced transmission with plug-type connector section 101 Flexible flat cable member for balanced transmission 102 First flexible flat Cable 103 Ground wire 103a Ground terminal portion 104 First signal wire 104a First signal terminal portion 105 Cover body 112 Second flexible flat cable 113a Ground terminal portion 114 Second signal wire 114a Second signal terminal portion 115 Cover Body 120 Plug type connector

Claims (5)

A balanced configuration in which signal transmission paths and ground portions that make a pair are alternately arranged so that balanced transmission is possible, and a signal terminal portion and a ground terminal portion that make a pair are exposed at the ends. A flat cable member for transmission;
A connector part forming member that is attached to an end of the flat cable member for balanced transmission and that forms a connector part having the signal terminal part itself and the ground terminal part itself of the flat cable member for balanced transmission as terminal parts. Become
Having the connector part at the end of the flat cable member for balanced transmission,
The flat cable member for balanced transmission has a first signal line pattern for transmitting a + signal constituting a pair and a second signal for transmitting a-signal that is equal in magnitude and opposite to the + signal on the upper surface of the base sheet. Signal line patterns and linear ground line patterns are alternately arranged, and the end portion of the base sheet has a ground terminal portion at the end of the ground line pattern and the first signal line pattern. A first flexible printed cable having a configuration in which the first signal terminal portions at the ends are alternately arranged;
A planar ground surface pattern is formed on the lower surface of the base sheet, and the end portion of the base sheet has alternating ground terminal portions and second signal terminal portions at the end of the ground surface pattern. And a second flexible printed cable having a configuration arranged in line with
The first flexible printed cable is overlaid on the second flexible printed cable and bonded except for both end portions, and the second signal line pattern and the second signal terminal portion are electrically connected. A flat cable for balanced transmission with a connector, wherein the ground line pattern and the ground plane pattern are conductively connected. In the flat cable for balanced transmission with a connector part according to claim 1 ,
The connector part forming member is a plate-like member interposed between an end part of the first flat cable and an end part of the second flat cable,
Fixing the end portion of the first flexible flat cable to the upper surface of the connector portion forming member, and fixing the end portion of the second flexible flat cable to the lower surface of the connector portion forming member;
The connector portion is a plug type with a connector portion, wherein the terminal portion of the first flexible flat cable is arranged on the upper surface and the terminal portion of the second flexible flat cable is arranged on the lower surface. Cable. The flat cable for balanced transmission with a connector part according to claim 2 ,
The connector portion forming member has a shallow concave flat surface portion on which an end portion of the first flexible flat cable is positioned on the upper surface, and an end portion of the second flexible flat cable on the lower surface. Is configured to have a shallow concave flat surface portion to be positioned,
The end of the first flexible flat cable is positioned and adhered and fixed in a shallow concave flat portion on the upper surface of the connector portion forming member,
The end portion of the second flexible flat cable is configured to be positioned and bonded and fixed in a shallow concave flat portion on the lower surface of the connector portion forming member. Flat cable. A flat cable for balanced transmission with a connector portion according to any one of claims 1 to 3 ,
A connector device comprising a connector to which a connector portion of a flat cable for balanced transmission with a connector portion is connected. The flat cable member for balanced transmission which comprises a part of flat cable for balanced transmission with a connector part in any one of Claims 1-3 .

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